List of US Office REITs: The Four Rosters That Count

Four reputable sources give four different counts, because each applies its own inclusion rules. REITNotes counts 41 office-sector REITs inside its database of 839 profiles, which spans US listed, non-listed, mortgage, ETF and global categories (472 of the 839 are global names). The Nareit Office REIT Sector Hub lists roughly 14-18 constituents, and its table includes a small number of international listings such as KDX Realty of Tokyo. Seeking Alpha's office REIT industry group holds 17 quant-rated tickers per its SSR metadata, while Yahoo Finance renders quote pages for roughly 10-20 US office REITs.

REITNotes - 839-REIT Database with FFO Data (Q2 2026) is the widest roster in this slice and the only one that attaches per-company earnings to every row. Its REITList tool exposes about 45 columns per REIT — REITRating scores, dividends, market cap and property counts — and the REITFFO tool carries quarterly FFO rows through Q2 2026. Filter the database down to its 41 office-sector names and you have the longest US office list available without paying an institutional vendor.

Nasdaq Data Link (Quandl) - REIT Datasets is the second route: keyed REST access that returns JSON, CSV or XML, with a free key tier described as generously limited even though most market-data products are premium (CFTC Commitment of Traders is cited as a free tables product). Neither platform hands you a curated office-sector roster, so the practical pattern is to fix the symbol list from the Nareit hub table or REITNotes first, then batch the API calls per ticker.

A list of US office REITs describes portfolios; the physical stock needs a different dataset. The EIA Commercial Buildings Energy Consumption Survey (CBECS 2018) is the only nationally representative look at US commercial buildings: a 6,436-record public-use microdata file representing roughly 5.9 million buildings, about 1,250 variables, and 22 pretabulated crosstabs by activity, size, age, region and climate zone, all in public-domain CSV, SAS, XLSX and PDF. Estimates break down nationally and by Census division only — no state-level detail — and prior editions reach back to 1979 for trend work.

For demand-side context beyond US borders, IBEF - India Industry Reports contributes free narrative coverage of Indian real estate and services, with historical series running from April 2000 and projections out to 2030-2033 across roughly 30 sector pages — useful when an office REIT tenant base leans on global capability centers.